Codemash CTF 2019 - On Site Challenge

Jan 11, 2019

Clue

Games are played all night.
This one online, but there, board.
Code is history

Hint

There is a code hidden somewhere in the Kalahari.

Approach

This clue pointed us to the game room in the Kalahari. There was a QR code on the walls that takes you to Bill Sempf’s User Talk page on the OWASP website. One thing that stood out was that the page was recently modified. Looking at the history, there is a string that was removed:

Y20xOS1rNGxhLWhhOWktYzAwbC1wbzBM

The string stood out as a base64 encoded string. Decoding that string yields our flag: